CVE-2026-28390

HIGH EPSS 52.1%
Published Apr 7, 20262mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Apr 7, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

Issue summary: During processing of a crafted CMS EnvelopedData message with KeyTransportRecipientInfo a NULL pointer dereference can happen. Impact summary: Applications that process attacker-controlled CMS data may crash before authentication or cryptographic operations occur resulting in Denial of Service. When a CMS EnvelopedData message that uses KeyTransportRecipientInfo with RSA-OAEP encryption is processed, the optional parameters field of RSA-OAEP SourceFunc algorithm identifier is examined without checking for its presence. This results in a NULL pointer dereference if the field is missing. Applications and services that call CMS_decrypt() on untrusted input (e.g., S/MIME processing or CMS-based protocols) are vulnerable. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
52.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 7

VendorProductVersionRange
opensslopenssl*≥1.0.2  –  <1.0.2zp
opensslopenssl*≥1.1.1  –  <1.1.1zg
opensslopenssl*≥3.0.0  –  <3.0.20
opensslopenssl*≥3.3.0  –  <3.3.7
opensslopenssl*≥3.4.0  –  <3.4.5
opensslopenssl*≥3.5.0  –  <3.5.6
opensslopenssl*≥3.6.0  –  <3.6.2

References 8

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-032379.html
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-265688.html
  • github.com https://github.com/openssl/openssl/commit/01194a8f1941115cd0383bfa91c736dd3993c8bc
    Patch
  • github.com https://github.com/openssl/openssl/commit/2e39b7a6993be445fddb9fbce316fa756e0397b6
    Patch
  • github.com https://github.com/openssl/openssl/commit/af2a5fecd3e71a29e7568f9c1453dec5cebbaff4
    Patch
  • github.com https://github.com/openssl/openssl/commit/ea7b4ea4f9f853521ba34830cbcadc970d2e0788
    Patch
  • github.com https://github.com/openssl/openssl/commit/fd2f1a6cf53b9ceeca723a001aa4b825d7c7ee75
    Patch
  • openssl-library.org https://openssl-library.org/news/secadv/20260407.txt
    Vendor Advisory

Remediation

  • github.com https://github.com/openssl/openssl/commit/01194a8f1941115cd0383bfa91c736dd3993c8bc
    Patch
  • github.com https://github.com/openssl/openssl/commit/2e39b7a6993be445fddb9fbce316fa756e0397b6
    Patch
  • github.com https://github.com/openssl/openssl/commit/af2a5fecd3e71a29e7568f9c1453dec5cebbaff4
    Patch
  • github.com https://github.com/openssl/openssl/commit/ea7b4ea4f9f853521ba34830cbcadc970d2e0788
    Patch
  • github.com https://github.com/openssl/openssl/commit/fd2f1a6cf53b9ceeca723a001aa4b825d7c7ee75
    Patch